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36

Sep 22, 2013
09/13

by
Kerstin Colonius

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Two ageing models were analysed whether they can confirm that the dauer mutation of the nematode helps to preserve the species. As a result the Penna model shows that populations with dauer larvae survive bad environmental conditions, whereas populations without it die out. In the Stauffer model the advantage of the dauer mutation for the survival is only given under certain conditions.

Source: http://arxiv.org/abs/q-bio/0403043v1

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19

Jun 28, 2018
06/18

by
Hans Colonius

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This paper presents an introduction to the stochastic concepts of \emph{coupling} and \emph{copula}. Coupling means the construction of a joint distribution of two or more random variables that need not be defined on one and the same probability space, whereas a copula is a function that joins a multivariate distribution to its one-dimensional margins. Their role in stochastic modeling is illustrated by examples from multisensory perception. Pointers to more advanced and recent treatments are...

Topics: Methodology, Statistics, Risk Management, Quantitative Methods, Quantitative Finance, Quantitative...

Source: http://arxiv.org/abs/1511.05303

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189

Oct 26, 2014
10/14

by
Colonius, Daniel

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12°.

Topic: Analysis paraphrastica Institutionum theologicarum Joh. Calvini disputationibus 41 contexta

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66

Nov 9, 2010
11/10

by
Colonius, Lillian

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Jun 29, 2018
06/18

by
Sebastian Liska; Tim Colonius

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A new parallel, computationally efficient immersed boundary method for solving three-dimensional, viscous, incompressible flows on unbounded domains is presented. Immersed surfaces with prescribed motions are generated using the interpolation and regularization operators obtained from the discrete delta function approach of the original (Peskin's) immersed boundary method. Unlike Peskin's method, boundary forces are regarded as Lagrange multipliers that are used to satisfy the no-slip...

Topics: Fluid Dynamics, Physics

Source: http://arxiv.org/abs/1604.01814

Thesis (B.S.)--University of Illinois at Urbana-Champaign, 1921

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Jun 28, 2018
06/18

by
Fritz Colonius; Boumediene Hamzi

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Methods from learning theory are used in the state space of linear dynamical and control systems in order to estimate the system matrices. An application to stabilization via algebraic Riccati equations is included. The approach is illustrated via a series of numerical examples.

Topics: Statistics, Optimization and Control, Statistics Theory, Dynamical Systems, Machine Learning,...

Source: http://arxiv.org/abs/1507.03111

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Jun 28, 2018
06/18

by
Hans Colonius; Adele Diederich

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A single neuron is categorized as"multisensory" if there is a statistically significant difference between the response evoked by an audio-visual stimulus combination and that evoked by the most effective of its components individually. Crossmodal enhancement is commonly expressed as a proportion of the strongest unisensory response. However, being responsive to multiple sensory modalities does not guarantee that a neuron has actually engaged in integrating its multiple sensory...

Topics: Neurons and Cognition, Quantitative Biology

Source: http://arxiv.org/abs/1507.08505

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Jun 28, 2018
06/18

by
Fritz Colonius; Guilherme Mazanti

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For a class of linear switched systems in continuous time a controllability condition implies that state feedbacks allow to achieve almost sure stabilization with arbitrary exponential decay rates. This is based on the Multiplicative Ergodic Theorem applied to an associated system in discrete time.

Topics: Dynamical Systems, Optimization and Control, Mathematics

Source: http://arxiv.org/abs/1511.06461

Thesis (B.S.)--University of Illinois at Urbana-Champaign, 1921

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Jun 29, 2018
06/18

by
Andres Goza; Tim Colonius

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We present a strongly-coupled immersed-boundary method for flow-structure interaction problems involving thin deforming bodies. The method is stable for arbitrary choices of solid-to-fluid mass ratios and for large body motions. As with many strongly-coupled immersed-boundary methods, our method requires the solution of a nonlinear algebraic system at each time step. The system is solved through iteration, where the iterates are obtained by linearizing the system and performing a block LU...

Topics: Fluid Dynamics, Physics

Source: http://arxiv.org/abs/1610.01115

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Jun 29, 2018
06/18

by
Sebastian Liska; Tim Colonius

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A computationally efficient method for solving three-dimensional, viscous, incompressible flows on unbounded domains is presented. The method formally discretizes the incompressible Navier-Stokes equations on an unbounded staggered Cartesian grid. Operations are limited to a finite computational domain through a lattice Green's function technique. This technique obtains solutions to inhomogeneous difference equations through the discrete convolution of source terms with the fundamental...

Topics: Fluid Dynamics, Physics, Computational Physics

Source: http://arxiv.org/abs/1601.00035

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Jun 30, 2018
06/18

by
Sebastian Liska; Tim Colonius

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A new fast multipole formulation for solving elliptic difference equations on unbounded domains and its parallel implementation are presented. These difference equations can arise directly in the description of physical systems, e.g. crystal structures, or indirectly through the discretization of PDEs. In the analog to solving continuous inhomogeneous differential equations using Green's functions, the proposed method uses the fundamental solution of the discrete operator on an infinite grid,...

Topics: Physics, Numerical Analysis, Computing Research Repository, Computational Physics

Source: http://arxiv.org/abs/1402.6081

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40

Oct 23, 2014
10/14

by
Gulberti, Alessandro; Arndt, Petra A.; Colonius, Hans

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This article is from Frontiers in Human Neuroscience , volume 8 . Abstract In the stop-signal paradigm, participants perform a primary reaction task, for example a visual or auditory discrimination task, and have to react to a go stimulus as quickly as possible with a specified motor response. In a certain percentage of trials, after presentation of the stimulus (go signal), another stimulus (stop signal) is presented with a variable stop-signal delay. Whenever a stop signal occurs, the...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3927451

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Nov 11, 2010
11/10

by
Colonius, Lillian; Schroeder, Glenn W., joint author

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A visit to an airport, describing briefly air mail, baggage handling, fuel entering a plane, hangars, and weather and control stations

Topic: Airports

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Sep 14, 2010
09/10

by
Colonius, Lillian; Schroeder, Glenn W., joint author

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Black and white photographs of sixteen animals in the zoo, including lions, llamas, flamingos, zebras, and giraffes, with one or two facts about each animal

Topics: Zoology, Animals

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Jun 27, 2018
06/18

by
Thibault L. B. Flinois; Tim Colonius

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The classical problem of suppressing vortex shedding in the wake of a circular cylinder by using body rotation is revisited in an adjoint-based optimal control framework. The cylinder's unsteady and fully unconstrained rotation rate is optimized at Reynolds numbers between 75 and 200 and over horizons that are longer than in previous studies, where they are typically of the order of a vortex shedding period or shorter. In the best configuration, the drag is reduced by 19%, the vortex shedding...

Topics: Fluid Dynamics, Physics

Source: http://arxiv.org/abs/1504.03949

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Oct 22, 2014
10/14

by
Steenken, Rike; Weber, Lars; Colonius, Hans; Diederich, Adele

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This article is from PLoS ONE , volume 9 . Abstract Modern driver assistance systems make increasing use of auditory and tactile signals in order to reduce the driver's visual information load. This entails potential crossmodal interaction effects that need to be taken into account in designing an optimal system. Here we show that saccadic reaction times to visual targets (cockpit or outside mirror), presented in a driving simulator environment and accompanied by auditory or tactile...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4011748

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Jun 29, 2018
06/18

by
Andres Goza; Sebastian Liska; Benjamin Morley; Tim Colonius

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Many immersed boundary methods solve for surface stresses that impose the velocity boundary conditions on an immersed body. These surface stresses may contain spurious oscillations that make them ill-suited for representing the physical surface stresses on the body. Moreover, these inaccurate stresses often lead to unphysical oscillations in the history of integrated surface forces such as the coefficient of lift. While the errors in the surface stresses and forces do not necessarily affect the...

Topics: Fluid Dynamics, Physics, Computational Physics

Source: http://arxiv.org/abs/1603.02306